Lightball standing then coming towards us extremly fast becoming large, becoming smaller and vanishing from one second to the other.

Went for a walk after dinner, a bright, tiny light was standing in the sky, above the the shore, close to a hill. Couldn't figure out what it was, so I asked my friend what it is. In this very moment the light started to come towards us in a speed I have never seen bevor, the light became about the size of a volleyball, it didn't look like an electrical light, it was very solid and bright. My friend and I were frozen to the ground and all we could think was: "Go away!!!!!!!". It was so scary because it was completly silent, no wind at all and just so different than anything else we have ever seen. After the light had become the size of a volleyball it started to move away from us to about a size of a prune and from one second to the other it vanished. We ran back to the hotel and asked the locals, if they know anything about strange lights at night. Nobody knew about this light. We talked for a long time trying to go through all the possibilities explaining this light. we could not find a solution, the closest was a helicopter in silent mode- but that didn't seem right as well.